The massive 6-foot-3, 331 pound Watts was impressive during the rookie minicamp and out-played a few undrafted rookies the Chargers signed after the NFL Draft. He started 14 games as a senior at West Texas A&M and 41 in his career for the Buffaloes.

Watts took home the Lone Star Conference’s Offensive Lineman of the Year award and was named to the First Team All-Conference roster in 2013. He joins former Buffaloes teammate wide receiver Torrence Allen on the Chargers’ roster.

Craig joins another Watts on the Chargers’ roster in third-round pick Chris Watt. Both are big physical guards that should provide the Chargers with much-needed depth on the offensive line.

It’s still left to be seen if Watts makes the final 53-man roster, but his combination of size and strength, along with a need at the position, should bode well for him. If he does make the roster he would likely be used in a back-up roll, similar to what Chris’ role will be this year.

This was the second addition in as many days for McCoy and the Chargers. They added Buffalo running back Branden Oliver yesterday. Oliver is a 5-foot-8, 203 pound back who finished his career at Buffalo as their all-time leading rusher (4,909 yards) and second in touchdowns (33).

It will be a tougher task for Oliver to make the final cut with the running back position already backloaded for the bolts. The Chargers already have Ryan Matthews, Danny Woodhead, Donald Brown and drafted Marion Grice. Oliver will have to impress on special teams and in other areas.

The Chargers look to be adding a lot of unknown players to their roster in hopes of finding a few gems. With a lack of depth at several positions they have the flexibility to make moves such as these. San Diego would only need one or two of these undrafted rookies to work out for these moves to be looked at as successful.

The next step in the Chargers’ offseason schedule is OTA’s. They will begin in less than a week on Tuesday, May 27th.

Grant Waller is a San Diego Chargers writer for RantSports.com. Follow him on Twitter @Grant_J_Waller and “Like” him on Facebook.